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+ The X Resize, Rotate and Reflect Extension
+ Version 1.2
+ 2006-4-13
+
+ Jim Gettys
+ Jim.Gettys@hp.com
+ Cambridge Research Laboratory
+ HP Labs
+ Hewlett Packard Company
+
+ Keith Packard
+ keith.packard@intel.com
+ Open Source Technology Center
+ Intel Corporation
+
+1. Introduction
+
+The X Resize, Rotate and Reflect Extension, called RandR for short,
+brings the ability to resize, rotate and reflect the root window of a
+screen. It is based on the X Resize and Rotate Extension as specified
+in the Proceedings of the 2001 Usenix Technical Conference [RANDR].
+
+RandR as implemented and integrated into the X server differs in
+one substantial fashion from the design discussed in that paper: that
+is, RandR 1.0 does not implement the depth switching described in that
+document, and the support described for that in the protocol in that
+document and in the implementation has been removed from the
+protocol described here, as it has been overtaken by events.
+
+These events include:
+ ► Modern toolkits (in this case, GTK+ 2.x) have progressed to the point
+ of implementing migration between screens of arbitrary depths
+ ► The continued advance of Moore's law has made limited amounts of VRAM
+ less of an issue, reducing the pressure to implement depth switching
+ on laptops or desktop systems
+ ► The continued decline of legacy toolkits whose design would have
+ required depth switching to support migration
+ ► The lack of depth switching implementation experience in the
+ intervening time, due to events beyond our control
+
+Additionally, the requirement to support depth switching might
+complicate other re-engineering of the device independent part of the
+X server that is currently being contemplated.
+
+Rather than further delaying RandR's widespread deployment for a feature
+long wanted by the community (resizing of screens, particularly on laptops),
+or the deployment of a protocol design that might be flawed due to lack of
+implementation experience, we decided to remove depth switching from the
+protocol. It may be implemented at a later time if resources and
+interests permit as a revision to the protocol described here, which will
+remain a stable base for applications. The protocol described here has been
+implemented in the main X.org server, and more fully in the hw/kdrive
+implementation in the distribution, which fully implements resizing,
+rotation and reflection.
+
+1.2 Introduction to version 1.2 of the extension
+
+One of the significant limitations found in version 1.1 of the RandR
+protocol was the inability to deal with the Xinerama model where multiple
+monitors display portions of a common underlying screen. In this environment,
+zero or more video outputs are associated with each CRT controller which
+defines both a set of video timings and a 'viewport' within the larger
+screen. This viewport is independent of the overall size of the screen, and
+may be located anywhere within the screen.
+
+The effect is to decouple the reported size of the screen from the size
+presented by each video output, and to permit multiple outputs to present
+information for a single screen.
+
+To extend RandR for this model, we separate out the output, CRTC and screen
+configuration information and permit them to be configured separately. For
+compatibility with the 1.1 version of the protocol, we make the 1.1 requests
+simultaneously affect both the screen and the (presumably sole) CRTC and
+output. The set of available outputs are presented with UTF-8 encoded names
+and may be connected to CRTCs as permitted by the underlying hardware. CRTC
+configuration is now done with full mode information instead of just size
+and refresh rate, and these modes have names. These names also use UTF-8
+encoding. New modes may also be added by the user.
+
+Additional requests and events are provided for this new functionality.
+
+ ┌────────────────────────────────┬──────────┐
+ ┏━━━━━━━┳───────────────┐ ╔════════╗ ╔════════╗
+ ┃ 1 ┃ │ ║ A ║ ║ B ║
+ ┃ ┏━━━╋━━━━━━━━━━━━━━━┫ ║ ║ ║ ║
+ ┣━━━╋━━━┛ ┃ ╚════════╝ ╚════════╝
+ │ ┃ 2 ┃─────────────────┐
+ │ ┃ ┃ ╔═══════════════════╗
+ │ ┃ ┃ ║ ║
+ │ ┗━━━━━━━━━━━━━━━━━━━┫ ║ C ║
+ └───────────────────────┘ ║ ║
+ ┌──────┐ ┏━━━━┓ ╔══════╗ ║ ║
+ │screen│ ┃CRTC┃ ║output║ ╚═══════════════════╝
+ └──────┘ ┗━━━━┛ ╚══════╝
+
+In this picture, the screen is covered (incompletely) by two CRTCs. CRTC1
+is connected to two outputs, A and B. CRTC2 is connected to output C.
+Outputs A and B will present exactly the same region of the screen using
+the same mode line. Output C will present a different (larger) region of
+the screen using a different mode line.
+
+RandR provides information about each available CRTC and output; the
+connection between CRTC and output is under application control, although
+the hardware will probably impose restrictions on the possible
+configurations. The protocol doesn't try to describe these restrictions,
+instead it provides a mechanism to find out what combinations are supported.
+
+For instance, dual-link DVI gangs two CRTC outputs together to provide higher
+bandwidth for large resolution screens. This is exposed in RandR by
+requiring that nothing be connected to the second CRTC when driving a high
+resolution screen on the first.
+
+1.1 Acknowledgements
+
+Our thanks to the contributors to the design found on the xpert mailing
+list, in particular:
+
+Alan Hourihane for work on the early implementation
+Andrew C. Aitchison for help with the XFree86 DDX implementation
+Andy Ritger for early questions about how mergefb/Xinerama work with RandR
+Carl Worth for editing the specification and Usenix paper
+David Dawes for XFree86 DDX integration work
+Thomas Winischhofer for the hardware-accelerated SiS rotation implementation
+Matthew Tippett and Kevin Martin for splitting outputs and CRTCs to more
+fully expose what video hardware can do
+
+ ❧❧❧❧❧❧❧❧❧❧❧
+
+2. Screen change model
+
+Screens may change dynamically, either under control of this extension, or
+due to external events. Examples include: monitors being swapped, pressing a
+button to switch from internal display to an external monitor on a laptop,
+or, eventually, the hotplug of a display card entirely on busses such as
+Cardbus or Express Card which permit hot-swap (which will require other work
+in addition to this extension).
+
+Since the screen configuration is dynamic and asynchronous to the client and
+may change at any time RandR provides mechanisms to ensure that your clients
+view is up to date with the configuration possibilities of the moment and
+enforces applications that wish to control the configuration to prove that
+their information is up to date before honoring requests to change the
+screen configuration (by requiring a timestamp on the request).
+
+Interested applications are notified whenever the screen configuration
+changes, providing the current size of the screen and subpixel order (see
+the Render extension [RENDER]), to enable proper rendering of subpixel
+decimated client text to continue, along with a time stamp of the
+configuration change. A client must refresh its knowledge of the screen
+configuration before attempting to change the configuration after a
+notification, or the request will fail.
+
+To avoid multiplicative explosion between orientation, reflection and sizes,
+the sizes are only those sizes in the normal (0) rotation.
+
+Rotation and reflection and how they interact can be confusing. In Randr,
+the coordinate system is rotated in a counter-clockwise direction relative
+to the normal orientation. Reflection is along the window system coordinate
+system, not the physical screen X and Y axis, so that rotation and
+reflection do not interact. The other way to consider reflection is to is
+specified in the "normal" orientation, before rotation, if you find the
+other way confusing.
+
+We expect that most clients and toolkits will be oblivious to changes to the
+screen structure, as they generally use the values in the connections Display
+structure directly. By toolkits updating the values on the fly, we believe
+pop-up menus and other pop up windows will position themselves correctly in
+the face of screen configuration changes (the issue is ensuring that pop-ups
+are visible on the reconfigured screen).
+
+ ❧❧❧❧❧❧❧❧❧❧❧
+
+3. Data Types
+
+The subpixel order is shared with the Render extension, and is documented
+there. The only datatype defined is the screen size, defined in the normal
+(0 degree) orientation.
+
+ ❧❧❧❧❧❧❧❧❧❧❧
+
+4. Errors
+
+Errors are sent using core X error reports.
+
+Output
+ A value for an OUTPUT argument does not name a defined OUTPUT.
+CRTC
+ A value for a CRTC argument does not name a defined CRTC.
+Mode
+ A value for a MODE argument does not name a defined MODE.
+
+ ❧❧❧❧❧❧❧❧❧❧❧
+
+5. Protocol Types
+
+RRCONFIGSTATUS { Success
+ InvalidConfigTime
+ InvalidTime
+ Failed }
+
+ A value of type RRCONFIGSTATUS returned when manipulating the output
+ configuration or querying information from the server that has some
+ time-dependency.
+
+ InvalidConfigTime indicates that the supplied configuration
+ timestamp does not match the current X server configuration
+ timestamp. Usually this means that the output configuration has
+ changed since the timestamp was received by the application.
+
+ InvalidTime indicates that the supplied output reconfiguration time
+ is earlier than the most recent output reconfiguration request.
+ Generally this indicates that another application has reconfigured
+ the output using a later timestamp.
+
+ Failed is returned whenever the operation is unsuccessful for some
+ other reason. This generally indicates that the requested output
+ configuration is unsupported by the hardware. The goal is to make
+ these limitations expressed by the protocol, but when that isn't
+ possible it is correct to return this error value. If, as a
+ implentor, you find this error code required, please submit the
+ hardware constraints that exist so that a future version of the
+ extension can correctly capture the configuration constraints in
+ your system.
+
+ROTATION { Rotate_0
+ Rotate_90
+ Rotate_180
+ Rotate_270
+ Reflect_X
+ Reflect_Y }
+
+ These values are used both to indicate a set of allowed rotations
+ and reflections as well as to indicate a specific rotation and
+ reflection combination.
+
+RRSELECTMASK { RRScreenChangeNotifyMask
+ RRCrtcChangeNotifyMask (New in version 1.2)
+ RROutputChangeNotifyMask (New in version 1.2)
+ RROutputPropertyNotifyMask (New in version 1.2) }
+
+SIZEID { CARD16 }
+
+MODE { XID or None }
+
+CRTC { XID }
+
+OUTPUT { XID }
+
+CONNECTION { Connected, Disconnected, UnknownConnection }
+
+ This value provides an indication of whether an output is actually
+ connected to a monitor or other presentation device.
+
+SUBPIXELORDER { SubPixelUnknown The subpixel order uses the Render
+ SubPixelHorizontalRGB extensions definitions; they are here
+ SubPixelHorizontalBGR only for convenience.
+ SubPixelVerticalRGB
+ SubPixelVerticalBGR
+ SubPixelNone }
+
+SCREENSIZE { widthInPixels, heightInPixels: CARD16
+ widthInMillimeters, heightInMillimeters: CARD16 }
+
+MODEFLAG { HSyncPositive
+ HSyncNegative
+ VSyncPositive
+ VSyncNegative
+ Interlace
+ DoubleScan
+ CSync
+ CSyncPositive
+ CSyncNegative
+ HSkewPresent
+ BCast
+ PixelMultiplex
+ DoubleClock
+ ClockDivideBy2 }
+
+MODEINFO { id: MODE
+ name: STRING
+ width, height: CARD16
+ dotClock: CARD32
+ hSyncStart, hSyncEnd, hTotal, hSkew: CARD16
+ vSyncStart, vSyncEnd, vTotal: CARD16
+ modeFlags: SETofMODEFLAG }
+
+REFRESH { rates: LISTofCARD16 }
+
+ ❧❧❧❧❧❧❧❧❧❧❧
+
+6. Extension Initialization
+
+The name of this extension is "RANDR".
+
+┌───
+ RRQueryVersion
+ client-major-version: CARD32
+ client-minor-version: CARD32
+ ▶
+ major-version: CARD32
+ minor-version: CARD32
+└───
+
+ The client sends the highest supported version to the server
+ and the server sends the highest version it supports, but no
+ higher than the requested version. Major versions changes can
+ introduce incompatibilities in existing functionality, minor
+ version changes introduce only backward compatible changes.
+ It is the clients responsibility to ensure that the server
+ supports a version which is compatible with its expectations.
+
+ ❧❧❧❧❧❧❧❧❧❧❧
+
+7. Extension Requests
+
+┌───
+ RRSelectInput
+ window: WINDOW
+ enable: SETofRRSELECTMASK
+└───
+ Errors: Window, Value
+
+ If 'enable' is RRScreenChangeNotifyMask, RRScreenChangeNotify events
+ will be sent when the screen configuration changes, either from
+ this protocol extension, or due to detected external screen
+ configuration changes. RRScreenChangeNotify may also be sent when
+ this request executes if the screen configuration has changed since
+ the client connected, to avoid race conditions.
+
+ New for version 1.2:
+
+ If 'enable' contains RRCrtcChangeMask, RRCrtcChangeNotify events
+ will be sent when a the configuration for a CRTC associated with the
+ screen changes, either through this protocol extension or due to
+ detected external changes. RRCrtcChangeNotify may also be sent when
+ this request executes if the CRTC configuration has changed since
+ the client connected, to avoid race conditions.
+
+ If 'enable' contains RROutputChangeMask, RROutputChangeNotify events
+ will be sent when a the configuration for an output associated with
+ the screen changes, either through this protocol extension or due to
+ detected external changes. RROutputChangeNotify may also be sent
+ when this request executes if the output configuration has changed
+ since the client connected, to avoid race conditions.
+
+ If 'enable' contains RROutputPropertyNotifyMask,
+ RROutputPropertyNotify events will be sent when properties change on
+ this output.
+
+┌───
+ RRSetScreenConfig
+ window: WINDOW
+ timestamp: TIMESTAMP
+ config-timestamp: TIMESTAMP
+ size-id: SIZEID
+ rotation: ROTATION
+ rate: CARD16
+ ▶
+ status: RRCONFIGSTATUS
+ new-timestamp: TIMESTAMP
+ config-timestamp: TIMESTAMP
+ root: WINDOW
+ subpixelOrder: SUBPIXELORDER
+└───
+ Errors: Value, Match
+
+ If 'timestamp' is less than the time when the configuration was last
+ successfully set, the request is ignored and InvalidTime returned in
+ status.
+
+ If 'config-timestamp' is not equal to when the server's screen
+ configurations last changed, the request is ignored and
+ InvalidConfigTime returned in status. This could occur if the
+ screen changed since you last made a RRGetScreenInfo request,
+ perhaps by a different piece of display hardware being installed.
+ Rather than allowing an incorrect call to be executed based on stale
+ data, the server will ignore the request.
+
+ 'rate' contains the desired refresh rate. If it is zero, the server
+ selects an appropriate rate.
+
+ This request may fail for other indeterminate reasons, in which case
+ 'status' will be set to Failed and no configuration change will be
+ made.
+
+ This request sets the screen to the specified size, rate, rotation
+ and reflection.
+
+ When this request succeeds, 'status' contains Success and the
+ requested changes to configuration will have been made.
+
+ 'new-time-stamp' contains the time at which this request was
+ executed.
+
+ 'config-timestamp' contains the time when the possible screen
+ configurations were last changed.
+
+ 'root' contains the root window for the screen indicated by the
+ window.
+
+ 'subpixelOrder' contains the resulting subpixel order of the screen
+ to allow correct subpixel rendering.
+
+ Value errors are generated when 'rotation', 'rate' or 'size-id'
+ are invalid.
+
+┌───
+ RRGetScreenInfo
+ window: WINDOW
+ ▶
+ rotations: SETofROTATION
+ root: WINDOW
+ timestamp: TIMESTAMP
+ config-timestamp: TIMESTAMP
+ size-id: SIZEID
+ rotation: ROTATION
+ rate: CARD16
+ sizes: LISTofSCREENSIZE
+ refresh: LISTofREFRESH
+└───
+
+ Errors: Window
+
+ RRGetScreenInfo returns information about the current and available
+ configurations for the screen associated with 'window'.
+
+ 'rotations' contains the set of rotations and reflections supported
+ by the screen.
+
+ 'root' is the root window of the screen.
+
+ 'config-timestamp' indicates when the screen configuration
+ information last changed: requests to set the screen will fail
+ unless the timestamp indicates that the information the client
+ is using is up to date, to ensure clients can be well behaved
+ in the face of race conditions.
+
+ 'timestamp' indicates when the configuration was last set.
+
+ 'size-id' indicates which size is active.
+
+ 'rate' is the current refresh rate. This is zero when the refresh
+ rate is unknown or on devices for which refresh is not relevant.
+
+ 'sizes' is the list of possible frame buffer sizes (at the normal
+ orientation. Each size indicates both the linear physical size of
+ the screen and the pixel size.
+
+ 'refresh' is the list of refresh rates for each size. Each element
+ of 'sizes' has a corresponding element in 'refresh'. An empty list
+ indicates no known rates, or a device for which refresh is not
+ relevant.
+
+ The default size of the screen (the size that would become the
+ current size when the server resets) is the first size in the
+ list.
+
+7.1. Extension Requests added in version 1.2 of the extension
+
+As introduced above, version 1.2 of the extension splits the screen size
+from the crtc and output configuration, permitting the subset of the screen
+presented by multiple outputs to be configured. As a separate notion, the
+size of the screen itself may be arbitrarily configured within a defined
+range. As crtcs and outputs are added and removed from the system, the set
+returned by the extension will change so that applications can detect
+dynamic changes in the display environment.
+
+┌───
+ RRGetScreenSizeRange
+ window: WINDOW
+ ▶
+ CARD16 minWidth, minHeight
+ CARD16 maxWidth, maxHeight
+└───
+ Errors: Window
+
+ Returns the range of possible screen sizes. The screen may be set to
+ any size within this range.
+
+┌───
+ RRSetScreenSize
+ window: WINDOW
+ width: CARD16
+ height: CARD16
+ width-in-millimeters: CARD32
+ height-in-millimeters: CARD32
+└───
+ Errors: Window, Match, Value
+
+ Sets the screen to the specified size. 'width' and 'height' must be
+ within the range allowed by GetScreenSizeRanges, otherwise a Value
+ error results. All active monitors must be configured to display a
+ subset of the specified size, else a Match error results.
+
+ 'width-in-millimeters' and 'height-in-millimeters' can be set to
+ reflect the physical size of the screen reported both through this
+ extension and the core protocol. They must be non-zero, or Value
+ error results.
+
+┌───
+ RRGetScreenResources
+ window: WINDOW
+ ▶
+ timestamp: TIMESTAMP
+ config-timestamp: TIMESTAMP
+ crtcs: LISTofCRTC
+ outputs: LISTofOUTPUT
+ modes: LISTofMODEINFO
+└───
+ Errors: Window
+
+ RRGetScreenResources returns the list of outputs and crtcs connected
+ to the screen associated with 'window'.
+
+ 'timestamp' indicates when the configuration was last set.
+
+ 'config-timestamp' indicates when the configuration information last
+ changed. Requests to configure the output will fail unless the
+ timestamp indicates that the information the client is using is up
+ to date, to ensure clients can be well behaved in the face of race
+ conditions.
+
+ 'crtcs' contains the list of CRTCs associated with the screen.
+
+ 'outputs' contains the list of outputs associated with the screen.
+
+ 'modes' contains the list of modes associated with the screen
+
+ This request explicitly asks the server to ensure that the
+ configuration data is up-to-date wrt the hardware. If that requires
+ polling, this is when such polling would take place. Requests for
+ further information should not poll, but rather return the data
+ collected at this point.
+
+┌───
+ RRGetOutputInfo
+ output: OUTPUT
+ config-timestamp: TIMESTAMP
+ ▶
+ status: RRCONFIGSTATUS
+ timestamp: TIMESTAMP
+ crtc: CRTC
+
+ name: STRING
+ connection: CONNECTION
+ subpixel-order: SUBPIXELORDER
+ widthInMillimeters, heightInMillimeters: CARD32
+ crtcs: LISTofCRTC
+ clones: LISTofOUTPUT
+ modes: LISTofMODE
+ num-preferred: CARD16
+└───
+ Errors: Output
+
+ RRGetOutputInfo returns information about the current and available
+ configurations 'output'.
+
+ If 'config-timestamp' does not match the current configuration
+ timestamp (as returned by RRGetScreenResources), 'status' is set to
+ InvalidConfigTime and the remaining reply data is empty. Otherwise,
+ 'status' is set to Success.
+
+ 'timestamp' indicates when the configuration was last set.
+
+ 'crtc' is the current source CRTC for video data, or Disabled if the
+ output is not connected to any CRTC.
+
+ 'name' is a UTF-8 encoded string designed to be presented to the
+ user to indicate which output this is. E.g. "S-Video" or "DVI".
+
+ 'connection' indicates whether the hardware was able to detect a
+ device connected to this output. If the hardware cannot determine
+ whether something is connected, it will set this to
+ UnknownConnection.
+
+ 'subpixel-order' contains the resulting subpixel order of the
+ connected device to allow correct subpixel rendering.
+
+ 'widthInMillimeters' and 'heightInMillimeters' report the physical
+ size of the displayed area. If unknown, or not really fixed (e.g.,
+ for a projector), these values are both zero.
+
+ 'crtcs' is the list of CRTCs that this output may be connected to.
+ Attempting to connect this output to a different CRTC results in a
+ Match error.
+
+ 'clones' is the list of outputs which may be simultaneously
+ connected to the same CRTC along with this output. Attempting to
+ connect this output with an output not in the 'clones' list
+ results in a Match error.
+
+ 'modes' is the list of modes supported by this output. Attempting to
+ connect this output to a CRTC not using one of these modes results
+ in a Match error.
+
+ The first 'num-preferred' modes in 'modes' are preferred by the
+ monitor in some way; for fixed-pixel devices, this would generally
+ indicate which modes match the resolution of the output device.
+
+┌───
+ RRListOutputProperties
+ output:OUTPUT
+ ▶
+ atoms: LISTof ATOM
+└───
+ Errors: Output
+
+ This request returns the atoms of properties currently defined on
+ the output.
+
+┌───
+ RRQueryOutputProperty
+ output: OUTPUT
+ property: ATOM
+ ▶
+ pending: BOOL
+ range: BOOL
+ immutable: BOOL
+ valid-values: LISTofINT32
+└───
+ Errors: Name, Atom, Output
+
+ If the specified property does not exist for the specified output,
+ then a Name error is returned.
+
+ If 'pending' is TRUE, changes made to property values with
+ RRChangeOutputProperty will be saved in the pending property value
+ and be automatically copied to the current value on the next
+ RRSetCrtcConfig request involving the named output. If 'pending' is
+ FALSE, changes are copied immediately.
+
+ If 'range' is TRUE, then the valid-values list will contain
+ precisely two values indicating the minimum and maximum allowed
+ values. If 'range' is FALSE, then the valid-values list will contain
+ the list of possible values; attempts to set other values will
+ result in a Value error.
+
+ If 'immutable' is TRUE, then the property configuration cannot be
+ changed by clients. Immutable properties are interpreted by the X
+ server.
+
+┌───
+ RRConfigureOutputProperty
+ output: OUTPUT
+ property: ATOM
+ pending: BOOL
+ range: BOOL
+ valid-values: LISTofINT32
+└───
+ Errors: Access, Name, Atom, Output
+
+ If the specified property is 'immutable', an Access error is
+ returned.
+
+ Otherwise, the configuration of the specified property is changed to
+ the values provided in this request.
+
+ If the specified property does not exist for the specified output,
+ it is created with an empty value and None type.
+
+┌───
+ RRChangeOutputProperty
+ output: OUTPUT
+ property, type: ATOM
+ format: {8, 16, 32}
+ mode: { Replace, Prepend, Append }
+ data: LISTofINT8 or LISTofINT16 or LISTofINT32
+└───
+ Errors: Alloc, Atom, Match, Value, Output
+
+ This request alters the value of the property for the specified
+ output. If the property is marked as a 'pending' property, only the
+ pending value of the property is changed. Otherwise, changes are
+ reflected in both the pending and current values of the property.
+ The type is uninterpreted by the server. The format specifies
+ whether the data should be viewed as a list of 8-bit, 16-bit, or
+ 32-bit quantities so that the server can correctly byte-swap as
+ necessary.
+
+ If the mode is Replace, the previous property value is discarded.
+ If the mode is Prepend or Append, then the type and format must
+ match the existing property value (or a Match error results). If
+ the property is undefined, it is treated as defined with the correct
+ type and format with zero-length data.
+
+ For Prepend, the data is tacked on to the beginning of the existing
+ data, and for Append, it is tacked on to the end of the existing data.
+
+ This request generates a OutputPropertyNotify
+
+ The lifetime of a property is not tied to the storing client.
+ Properties remain until explicitly deleted, until the output is
+ destroyed, or until server reset (see section 10).
+
+ The maximum size of a property is server-dependent and may vary
+ dynamically.
+
+┌───
+ RRDeleteOutputProperty
+ output: OUTPUT
+ property: ATOM
+└───
+ Errors: Atom, Output
+
+ This request deletes the property from the specified window if the
+ property exists and generates a OutputPropertyNotify event unless
+ the property does not exist.
+
+┌───
+ RRGetOutputProperty
+ output: OUTPUT
+ property: ATOM
+ type: ATOM or AnyPropertyType
+ long-offset, long-length: CARD32
+ delete: BOOL
+ pending: BOOL
+ ▶
+ type: ATOM or None
+ format: {0, 8, 16, 32}
+ bytes-after: CARD32
+ value: LISTofINT8 or LISTofINT16 or LISTofINT32
+└───
+ Errors: Atom, Value, Output
+
+ If the specified property does not exist for the specified output,
+ then the return type is None, the format and bytes-after are zero,
+ and the value is empty. The delete argument is ignored in this
+ case.
+
+ If the specified property exists but its type does not match the
+ specified type, then the return type is the actual type of the
+ property, the format is the actual format of the property (never
+ zero), the bytes-after is the length of the property in bytes (even
+ if the format is 16 or 32), and the value is empty. The delete
+ argument is ignored in this case.
+
+ If the specified property exists and either AnyPropertyType is
+ specified or the specified type matches the actual type of the
+ property, then the return type is the actual type of the property,
+ the format is the actual format of the property (never zero), and
+ the bytes-after and value are as follows, given:
+
+ N = actual length of the stored property in bytes
+ (even if the format is 16 or 32)
+ I = 4 × offset
+ T = N - I
+ L = MINIMUM(T, 4 × long-length)
+ A = N - (I + L)
+
+ If 'pending' is true, and if the property holds a pending value,
+ then the value returned will be the pending value of the property
+ rather than the current value. The returned value starts at byte
+ index I in the property (indexing from 0), and its length in bytes
+ is L. However, it is a Value error if long-offset is given such
+ that L is negative. The value of bytes-after is A, giving the
+ number of trailing unread bytes in the stored property. If delete
+ is True and the bytes-after is zero, the property is also deleted
+ from the output, and a RROutputPropertyNotify event is generated.
+
+┌───
+ RRCreateMode
+ window: WINDOW
+ modeinfo: MODEINFO
+ ▶
+ mode: MODE
+└───
+ Errors: Window, Name, Value
+
+ 'modeinfo' provides a new mode for outputs on the screen
+ associated with 'window'. If the name of 'modeinfo' names an
+ existing mode, a Name error is returned. If some parameter of the
+ mode is not valid in some other way, a Value error is returned.
+
+ The returned 'mode' provides the id for the mode.
+
+┌───
+ RRDestroyMode
+ mode: MODE
+└───
+ Errors: Mode, Access
+
+ The user-defined 'mode' is destroyed. 'mode' must name a mode
+ defined with RRCreateMode, else an Match error is returned. If
+ 'mode' is in use by some CRTC or Output, then an Access error is
+ returned.
+
+┌───
+ RRAddOutputMode
+ output: OUTPUT
+ mode: MODE
+└───
+ Errors: Output, Mode, Match
+
+ 'output' indicates which output is to be configured.
+
+ 'mode' specifies which mode to add. If 'mode' is not valid for
+ 'output', then a Match error is generated.
+
+ This request generates OutputChangeNotify events.
+
+┌───
+ RRDeleteOutputMode
+ output: OUTPUT
+ mode: MODE
+└───
+ Errors: Output, Mode
+
+ 'output' indicates which output is to be configured.
+
+ 'mode' specifies which mode to delete. 'mode' must have been added
+ with RRAddOutputMode, else an Access error is returned. 'mode' must
+ not be active, else a Match error is returned.
+
+ This request generates OutputChangeNotify events.
+
+┌───
+ RRGetCrtcInfo
+ crtc: CRTC
+ config-timestamp: TIMESTAMP
+ ▶
+ status: RRCONFIGSTATUS
+ timestamp: TIMESTAMP
+ x, y: INT16
+ width, height: CARD16
+ mode: MODE
+ rotation: ROTATION
+ outputs: LISTofOUTPUT
+
+ rotations: SETofROTATION
+ possible-outputs: LISTofOUTPUT
+└───
+
+ Errors: Window
+
+ RRGetCrtcModes returns information about the current and available
+ configurations for the specified crtc connected to the screen
+ associated with 'window'.
+
+ If 'config-timestamp' does not match the current configuration
+ timestamp (as returned by RRGetScreenResources), 'status' is set to
+ InvalidConfigTime and the remaining reply data is empty. Otherwise,
+ 'status' is set to Success.
+
+ 'timestamp' indicates when the configuration was last set.
+
+ 'x' and 'y' indicate the position of this CRTC within the screen
+ region. They will be set to 0 when the CRTC is disabled.
+
+ 'width' and 'height' indicate the size of the area presented by this
+ CRTC.
+
+ 'mode' indicates which mode is active, or None indicating that the
+ CRTC has been disabled and is not displaying the screen contents.
+
+ 'rotation' indicates the active rotation. It is set to Rotate_0
+ when the CRTC is disabled.
+
+ 'outputs' is the list of outputs currently connected to this CRTC
+ and is empty when the CRTC is disabled.
+
+ 'rotations' contains the set of rotations and reflections supported
+ by the CRTC.
+
+ 'possible-outputs' lists all of the outputs which may be connected
+ to this CRTC.
+
+┌───
+ RRSetCrtcConfig
+ crtc: CRTC
+ timestamp: TIMESTAMP
+ config-timestamp: TIMESTAMP
+ x, y: INT16
+ mode: MODE
+ rotation: ROTATION
+ outputs: LISTofOUTPUT
+ ▶
+ status: RRCONFIGSTATUS
+ new-timestamp: TIMESTAMP
+└───
+ Errors: Value, Match
+
+ If 'timestamp' is less than the time when the configuration was last
+ successfully set, the request is ignored and InvalidTime returned in
+ status.
+
+ If 'config-timestamp' is not equal to when the monitor's
+ configuration last changed, the request is ignored and
+ InvalidConfigTime returned in status. This could occur if the
+ monitor changed since you last made a RRGetScreenInfo request,
+ perhaps by a different monitor being connected to the machine.
+ Rather than allowing an incorrect call to be executed based on stale
+ data, the server will ignore the request.
+
+ 'x' and 'y' contain the desired location within the screen for this
+ monitor's content. 'x' and 'y' must be within the screen size, else
+ a Value error results.
+
+ 'mode' is either the desired mode or None indicating the CRTC should
+ be disabled. If 'mode' is not one of these values, a Value
+ error results. 'mode' must be valid for all of the configured outputs,
+ else a Match error.
+
+ 'rotation' contains the desired rotation along with which
+ reflections should be enabled. The rotation and reflection values
+ must be among those allowed for this monitor, else a Value error
+ results.
+
+ 'outputs' contains the set of outputs that this CRTC should be
+ connected to. The set must be among the list of acceptable output
+ sets for this CRTC or a Match error results.
+
+ If 'mode' is None, then 'outputs' must be empty, else a Match error
+ results. Conversely, if 'mode' is not None, then 'outputs' must not be
+ empty, else a Match error results.
+
+ This request may fail for other indeterminate reasons, in which case
+ 'status' will be set to Failed and no configuration change will be
+ made.
+
+ This request sets the CRTC to the specified position, mode, rotation
+ and reflection. The entire area of the CRTC must fit within the
+ screen size, else a Match error results. As an example, rotating the
+ screen so that a single CRTC fills the entire screen before and
+ after may necessitate disabling the CRTC, resizing the screen,
+ then re-enabling the CRTC at the new configuration to avoid an
+ invalid intermediate configuration.
+
+ When this request succeeds, 'status' contains Success and the
+ requested changes to configuration will have been made.
+
+ 'new-time-stamp' contains the time at which this request was
+ executed.
+
+┌───
+ RRGetCrtcGammaSize
+ crtc: CRTC
+ ▶
+ size: CARD16
+└───
+ Errors: Crtc
+
+ This request returns the size of the gamma ramps used by 'crtc'.
+
+┌───
+ RRGetCrtcGamma
+ crtc: CRTC
+ ▶
+ red: LISTofCARD16
+ green: LISTofCARD16
+ blue: LISTofCARD16
+└───
+ Errors: Crtc
+
+ This request returns the currently set gamma ramps for 'crtc'. All
+ three lists will be the size returned by the RRGetCrtcGammaSize
+ request.
+
+┌───
+ RRSetCrtcGamma
+ crtc: CRTC
+ red: LISTofCARD16
+ green: LISTofCARD16
+ blue: LISTofCARD16
+└───
+ Errors: Crtc, Match
+
+ This request sets the gamma ramps for 'crtc'. All three lists
+ must be the size returned by RRGetCrtcGammaSize else a Value error
+ results.
+
+ ❧❧❧❧❧❧❧❧❧❧❧
+
+8. Extension Events
+
+Clients MAY select for ConfigureNotify on the root window to be
+informed of screen changes. This may be advantageous if all your
+client needs to know is the size of the root window, as it avoids
+round trips to set up the extension.
+
+RRScreenChangeNotify is sent if RRSelectInput has requested it
+whenever properties of the screen change, which may be due to external
+factors, such as re-cabling a monitor, etc.
+
+┌───
+ RRScreenChangeNotify
+
+ rotation: ROTATION; new rotation
+ sequenceNumber: CARD16 low 16 bits of request seq. number
+ timestamp: TIMESTAMP time screen was changed
+ configTimestamp: TIMESTAMP time config data was changed
+ root: WINDOW root window of screen
+ window: WINDOW window requesting notification
+ size-id: SIZEID index of new size
+ subpixelOrder: SUBPIXELORDER order of subpixels
+ widthInPixels: CARD16
+ heightInPixels: CARD16
+ widthInMillimeters: CARD16
+ heightInMillimeters: CARD16
+└───
+ This event is generated whenever the screen configuration is changed
+ and sent to requesting clients. 'timestamp' indicates when the
+ screen configuration was changed. 'configTimestamp' says when the
+ last time the configuration was changed. 'root' is the root of the
+ screen the change occurred on, 'window' is window selecting for this
+ event. 'size-id' contains the index of the current size.
+
+ This event is sent whenever the screen's configuration changes
+ or if a new screen configuration becomes available that was
+ not available in the past. In this case (config-timestamp in
+ the event not being equal to the config-timestamp returned in
+ the last call to RRGetScreenInfo), the client MUST call
+ RRGetScreenInfo to update its view of possible screen
+ configurations to have a correct view of possible screen
+ organizations.
+
+ Clients which select screen change notification events may be
+ sent an event immediately if the screen configuration was
+ changed between when they connected to the X server and
+ selected for notification. This is to prevent a common race
+ that might occur on log-in, where many applications start up
+ just at the time when a display manager or log in script might
+ be changing the screen size or configuration.
+
+8.1 Events added in version 1.2 of the RandR extension
+
+┌───
+ RROutputChangeNotify:
+ timestamp: TIMESTAMP time screen was reconfigured
+ config-timestamp: TIMESTAMP time available config data was changed
+ window: WINDOW window requesting notification
+ output: OUTPUT output affected by change
+ crtc: CRTC connected CRTC or None
+ mode: MODE mode in use on CRTC or None
+ connection: CONNECTION connection status
+└───
+
+ This event is generated whenever the available output configurations
+ have changed and is sent to requesting clients. 'timestamp'
+ indicates when the crtc configuration was changed by a client.
+ 'config-timestamp' says when the last time the available
+ configurations changed. 'root' is the root of the screen the change
+ occurred on, 'window' is window selecting for this event. The
+ precise change can be detected by examining the new state of the
+ system.
+
+┌───
+ RROutputPropertyNotify:
+ window: WINDOW window requesting notification
+ output: OUTPUT output affected by change
+ atom: ATOM affected property
+ time: TIMESTAMP time property was changed
+ subpixel-order: SUBPIXELORDER order of subpixels
+ state: { NewValue, Deleted } new property state
+└───
+
+ This event is reported to clients selecting RROutputPropertyChange
+ on the window and is generated with state NewValue when a property
+ of the window is changed using RRChangeOutputProperty even when
+ adding zero-length data and when replacing all or part of a property
+ with identical data. It is generated with state Deleted when a
+ property of the window is deleted using either
+ RRDeleteOutputProperty or RRGetOutputProperty. The timestamp
+ indicates the server time when the property was changed.
+
+┌───
+ RRCrtcChangeNotify
+ timestamp: TIMESTAMP time monitor was changed
+ config-timestamp: TIMESTAMP time config data was changed
+ root: WINDOW root window of screen
+ window: WINDOW window requesting notification
+ crtc: CRTC CRTC which changed
+ mode: MODE new mode
+ rotation: ROTATION; new rotation
+ x: INT16 x position of CRTC within screen
+ y: INT16 y position of CRTC within screen
+└───
+ This event is generated whenever the CRTC configuration is changed
+ and sent to requesting clients. 'timestamp' indicates when the
+ CRTC configuration was changed. 'config-timestamp' says when the
+ last time the configuration was changed. 'root' is the root of the
+ screen the change occurred on, 'window' is window selecting for this
+ event.
+
+ This event is sent whenever the monitor's configuration changes
+ or if a new monitor configuration becomes available that was
+ not available in the past. In this case (config-timestamp in
+ the event not being equal to the config-timestamp returned in
+ the last call to RRGetCrtcModes), the client MUST call
+ RRGetCrtcModes to update its view of possible monitor
+ configurations to have a correct view of possible monitor
+ organizations.
+
+ Clients which select monitor change notification events may be
+ sent an event immediately if the monitor configuration was
+ changed between when they connected to the X server and
+ selected for notification. This is to prevent a common race
+ that might occur on log-in, where many applications start up
+ just at the time when a display manager or log in script might
+ be changing the monitor size or configuration.
+
+ ❧❧❧❧❧❧❧❧❧❧❧
+
+9. Extension Versioning
+
+The RandR extension was developed in parallel with the implementation
+to ensure the feasibility of various portions of the design. As
+portions of the extension are implemented, the version number of the
+extension has changed to reflect the portions of the standard provided.
+This document describes the version 1.2 of the specification, the
+partial implementations have version numbers less than that. Here's a
+list of what each version provided:
+
+ 0.0: This prototype implemented resize and rotation in the
+ TinyX server Used approximately the protocol described in
+ the Usenix paper. Appeared in the TinyX server in
+ XFree86 4.2, but not in the XFree86 main server.
+
+ 0.1: Added subpixel order, added an event for subpixel order.
+ This version was never checked in to XFree86 CVS.
+
+ 1.0: Implements resize, rotation, and reflection. Implemented
+ both in the XFree86 main server (size change only at this
+ date), and fully (size change, rotation, and reflection)
+ in XFree86's TinyX server.
+
+ 1.1: Added refresh rates
+
+ 1.2: Separate screens from CRTCs and outputs, switch to full VESA
+ modes
+
+Compatibility between 0.0 and 1.0 was *NOT* preserved, and 0.0 clients
+will fail against 1.0 servers. The wire encoding op-codes were
+changed for GetScreenInfo to ensure this failure in a relatively
+graceful way. Version 1.1 servers and clients are cross compatible with
+1.0. Version 1.1 is considered to be stable and we intend upward
+compatibility from this point. Version 1.2 offers an extended model of the
+system with multiple output support. It offers backward compatibility with
+version 1.1.
+
+ ❧❧❧❧❧❧❧❧❧❧❧
+
+10. Relationship with other extensions
+
+Two other extensions have a direct relationship with this extension. This
+section attempts to explain how these three are supposed to work together.
+
+10.1 XFree86-VidModeExtension
+
+XFree86-VidModeExtension changes the configuration of a single monitor
+attached to the screen without changing the configuration of the screen
+itself. It provides the ability to specify new mode lines for the server to
+use along with selecting among existing mode lines. As it uses screen
+numbers instead of window identifiers, it can be used to affect multiple
+monitors in a single-screen Xinerama configuration. However, the association
+between screen numbers and root windows in a multi-Screen environment is not
+defined by the extension. Version 2.0 of this extension added the ability to
+adjust the DAC values in a TrueColor server to modify the brightness curves
+of the display.
+
+All of the utility of this extension is subsumed by RandR version 1.2, RandR
+should be used in preference to XFree86-VidModeExtension where both are
+present.
+
+10.2 Xinerama
+
+Xinerama provides a mechanism for describing the relationship between the
+overall screen display and monitors placed within that area. As such, it
+provides the query functionality of RandR 1.2 without any of the
+configuration functionality. Applications using Xinerama to discover
+monitor geometry can continue to do so, with the caveat that they will not be
+informed of changes when they occur. However, Xinerama configuration data
+will be updated, so applications selecting for RandR notification and
+re-querying the configuration with the Xinerama extension will get updated
+information. It is probably better to view RandR as a superset of Xinerama
+at this point and use it in preference to Xinerama where both are present.
+
+ ❧❧❧❧❧❧❧❧❧❧❧
+
+Appendix A. Protocol Encoding
+
+Syntactic Conventions
+
+This document uses the same syntactic conventions as the core X
+protocol encoding document.
+
+A.1 Common Types
+
+┌───
+ ROTATION
+ 0x0001 Rotate_0
+ 0x0002 Rotate_90
+ 0x0004 Rotate_180
+ 0x0008 Rotate_270
+ 0x0010 Reflect_X
+ 0x0020 Reflect_Y
+└───
+ Used to encode both sets of possible rotations and individual
+ selected rotations.
+
+┌───
+ RRSELECTMASK
+ 0x0001 ScreenChangeNotifyMask
+ 0x0002 CrtcChangeNotifyMask Added in version 1.2
+ 0x0004 OutputChangeNotifyMask Added in version 1.2
+ 0x0008 OutputPropertyNotifyMask Added in version 1.2
+└───
+ Event select mask for RRSelectInput
+
+┌───
+ RRCONFIGSTATUS
+ 0x0 Success
+ 0x1 InvalidConfigTime
+ 0x2 InvalidTime
+ 0x3 Failed
+└───
+ Return status for requests which depend on time.
+
+┌───
+ MODEINFO (32) Added in version 1.2
+ 4 CARD32 id
+ 2 CARD16 width in pixels
+ 2 CARD16 height in pixels
+ 4 CARD32 dot clock
+ 2 CARD16 h sync start
+ 2 CARD16 h sync end
+ 2 CARD16 h total
+ 2 CARD16 h skew
+ 2 CARD16 v sync start
+ 2 CARD16 v sync end
+ 2 CARD16 v total
+ 2 CARD16 name length
+ 4 SETofMODEFLAG mode flags
+└───
+
+ An output mode specifies the complete CRTC timings for
+ a specific mode. The vertical and horizontal synchronization rates
+ can be computed given the dot clock and the h total/v total
+ values. If the dot clock is zero, then all of the timing
+ parameters and flags are not used, and must be zero as this
+ indicates that the timings are unknown or otherwise unused.
+ The name itself will be encoded separately in each usage.
+
+┌───
+ MODEFLAG
+ 0x00000001 HSyncPositive
+ 0x00000002 HSyncNegative
+ 0x00000004 VSyncPositive
+ 0x00000008 VSyncNegative
+ 0x00000010 Interlace
+ 0x00000020 DoubleScan
+ 0x00000040 CSync
+ 0x00000080 CSyncPositive
+ 0x00000100 CSyncNegative
+ 0x00000200 HSkewPresent
+ 0x00000400 BCast
+ 0x00000800 PixelMultiplex
+ 0x00001000 DoubleClock
+ 0x00002000 ClockDivideBy2
+└───
+┌───
+ CONNECTION
+ 0 Connected
+ 1 Disconnected
+ 2 UnknownConnection
+└───
+
+
+A.2 Protocol Requests
+
+Opcodes 1 and 3 were used in the 0.0 protocols, and will return
+errors if used in version 1.0.
+
+┌───
+ RRQueryVersion
+
+ 1 CARD8 major opcode
+ 1 0 RandR opcode
+ 2 3 length
+ 4 CARD32 major version
+ 4 CARD32 minor version
+ ▶
+ 1 1 Reply
+ 1 unused
+ 2 CARD16 sequence number
+ 4 0 reply length
+ 1 CARD32 major version
+ 1 CARD32 minor version
+└───
+┌───
+ RRSetScreenConfig
+
+ 1 CARD8 major opcode
+ 1 2 RandR opcode
+ 2 6 length
+ 4 WINDOW window on screen to be configured
+ 4 TIMESTAMP timestamp
+ 4 TIMESTAMP config timestamp
+ 2 SIZEID size index
+ 2 ROTATION rotation/reflection
+ 2 CARD16 refresh rate (1.1 only)
+ 2 CARD16 pad
+ ▶
+ 1 1 Reply
+ 1 RRCONFIGSTATUS status
+ 2 CARD16 sequence number
+ 4 0 reply length
+ 4 TIMESTAMP new timestamp
+ 4 TIMESTAMP new configuration timestamp
+ 4 WINDOW root
+ 2 SUBPIXELORDER subpixel order defined in Render
+ 2 CARD16 pad4
+ 4 CARD32 pad5
+ 4 CARD32 pad6
+└───
+┌───
+ RRSelectInput
+
+ 1 CARD8 major opcode
+ 1 4 RandR opcode
+ 2 3 length
+ 4 WINDOW window
+ 2 SETofRRSELECTMASK enable
+ 2 CARD16 pad
+└───
+┌───
+ RRGetScreenInfo
+
+ 1 CARD8 major opcode
+ 1 5 RandR opcode
+ 2 2 length
+ 4 WINDOW window
+ ▶
+ 1 1 Reply
+ 1 CARD8 set of Rotations
+ 2 CARD16 sequence number
+ 4 0 reply length
+ 4 WINDOW root window
+ 4 TIMESTAMP timestamp
+ 4 TIMESTAMP config timestamp
+ 2 CARD16 number of SCREENSIZE following
+ 2 SIZEID current size index
+ 2 ROTATION current rotation and reflection
+ 2 CARD16 current rate (added in version 1.1)
+ 2 CARD16 length of rate info (number of CARD16s)
+ 2 CARD16 pad
+
+ SCREENSIZE
+ 2 CARD16 width in pixels
+ 2 CARD16 height in pixels
+ 2 CARD16 width in millimeters
+ 2 CARD16 height in millimeters
+
+ REFRESH
+ 2 CARD16 number of rates (n)
+ 2n CARD16 rates
+└───
+
+A.2.1 Protocol Requests added with version 1.2
+
+┌───
+ RRGetScreenSizeRange
+ 1 CARD8 major opcode
+ 1 6 RandR opcode
+ 2 2 length
+ 4 WINDOW window
+ ▶
+ 1 1 Reply
+ 1 unused
+ 2 CARD16 sequence number
+ 4 0 reply length
+ 2 CARD16 minWidth
+ 2 CARD16 minHeight
+ 2 CARD16 maxWidth
+ 2 CARD16 maxHeight
+ 16 unused
+└───
+┌───
+ RRSetScreenSize
+ 1 CARD8 major opcode
+ 1 7 RandR opcode
+ 2 5 length
+ 4 WINDOW window
+ 2 CARD16 width
+ 2 CARD16 height
+ 4 CARD32 width in millimeters
+ 4 CARD32 height in millimeters
+└───
+┌───
+ RRGetScreenResources
+ 1 CARD8 major opcode
+ 1 8 RandR opcode
+ 2 2 length
+ 4 WINDOW window
+ ▶
+ 1 1 Reply
+ 1 unused
+ 2 CARD16 sequence number
+ 4 c+o+8m+(b+p)/4 reply length
+ 4 TIMESTAMP timestamp
+ 4 TIMESTAMP config-timestamp
+ 2 c number of CRTCs
+ 2 o number of outputs
+ 2 m number of modeinfos
+ 2 b total bytes in mode names
+ 8 unused
+ 4c LISTofCRTC crtcs
+ 4o LISTofOUTPUT outputs
+ 32m LISTofMODEINFO modeinfos
+ b STRING8 mode names
+ p unused, p=pad(b)
+└───
+┌───
+ RRGetOutputInfo
+ 1 CARD8 major opcode
+ 1 9 RandR opcode
+ 2 3 length
+ 4 OUTPUT output
+ 4 TIMESTAMP config-timestamp
+ ▶
+ 1 1 Reply
+ 1 RRCONFIGSTATUS status
+ 2 CARD16 sequence number
+ 4 1+c+m+(n+p)/4 reply length
+ 4 TIMESTAMP timestamp
+ 4 CRTC current connected crtc
+ 4 CARD32 width in millimeters
+ 4 CARD32 height in millimeters
+ 1 CONNECTION connection
+ 1 SUBPIXELORDER subpixel-order
+ 2 c number of CRTCs
+ 2 m number of modes
+ 2 p number of preferred modes
+ 2 o number of clones
+ 2 n length of name
+ 4c LISTofCRTC crtcs
+ 4m LISTofMODE modes
+ n STRING8 name
+ p unused, p=pad(n)
+└───
+┌───
+ RRListOutputProperties
+ 1 CARD8 major opcode
+ 1 10 RandR opcode
+ 2 2 length
+ 4 OUTPUT output
+ ▶
+ 1 1 Reply
+ 1 unused
+ 2 CARD16 sequence number
+ 4 n reply length
+ 2 n number of ATOMs in atoms
+ 22 unused
+ 4n LISTofATOM atoms
+└───
+┌───
+ RRQueryOutputProperty
+ 1 CARD8 major opcode
+ 1 11 RandR opcode
+ 2 3 request length
+ 4 OUTPUT output
+ 4 ATOM property
+ ▶
+ 1 1 Reply
+ 1 unused
+ 2 CARD16 sequence number
+ 4 n reply length
+ 1 BOOL pending
+ 1 BOOL range
+ 1 BOOL immutable
+ 21 unused
+ 4n LISTofINT32 valid values
+└───
+┌───
+ RRConfigureOutputProperty
+ 1 CARD8 major opcode
+ 1 12 RandR opcode
+ 2 4+n request length
+ 4 OUTPUT output
+ 4 ATOM property
+ 1 BOOL pending
+ 1 BOOL range
+ 2 unused
+ 4n LISTofINT32 valid values
+└───
+┌───
+ RRChangeOutputProperty
+ 1 CARD8 major opcode
+ 1 13 RandR opcode
+ 2 6+(n+p)/4 request length
+ 4 OUTPUT output
+ 4 ATOM property
+ 4 ATOM type
+ 1 CARD8 format
+ 1 mode
+ 0 Replace
+ 1 Prepend
+ 2 Append
+ 2 unused
+ 4 CARD32 length of data in format units
+ (= n for format = 8)
+ (= n/2 for format = 16)
+ (= n/4 for format = 32)
+ n LISTofBYTE data
+ (n is a multiple of 2 for format = 16)
+ (n is a multiple of 4 for format = 32)
+ p unused, p=pad(n)
+└───
+┌───
+ RRDeleteOutputProperty
+ 1 CARD8 major opcode
+ 1 14 RandR opcode
+ 2 3 request length
+ 4 OUTPUT output
+ 4 ATOM property
+└───
+┌───
+ RRGetOutputProperty
+ 1 CARD8 major opcode
+ 1 15 RandR opcode
+ 2 7 request length
+ 4 OUTPUT output
+ 4 ATOM property
+ 4 ATOM type
+ 0 AnyPropertyType
+ 4 CARD32 long-offset
+ 4 CARD32 long-length
+ 1 BOOL delete
+ 1 BOOL pending
+ 2 unused
+ ▶
+ 1 1 Reply
+ 1 CARD8 format
+ 2 CARD16 sequence number
+ 4 (n+p)/4 reply length
+ 4 ATOM type
+ 0 None
+ 4 CARD32 bytes-after
+ 4 CARD32 length of value in format units
+ (= 0 for format = 0)
+ (= n for format = 8)
+ (= n/2 for format = 16)
+ (= n/4 for format = 32)
+ 12 unused
+ n LISTofBYTE value
+ (n is zero for format = 0)
+ (n is a multiple of 2 for format = 16)
+ (n is a multiple of 4 for format = 32)
+ p unused, p=pad(n)
+└───
+┌───
+ RRCreateMode
+ 1 CARD8 major opcode
+ 1 16 RandR opcode
+ 2 12+(n+p)/4 length
+ 4 WINDOW window
+ 32 MODEINFO mode
+ n STRING8 mode name
+ p unused, p=pad(n)
+ ▶
+ 1 1 Reply
+ 1 unused
+ 2 CARD16 sequence number
+ 4 0 reply length
+ 4 MODE mode
+ 20 unused
+└───
+┌───
+ RRDestroyMode
+ 1 CARD8 major opcode
+ 1 17 RandR opcode
+ 2 2 length
+ 4 MODE mode
+└───
+┌───
+ RRAddOutputMode
+ 1 CARD8 major opcode
+ 1 18 RandR opcode
+ 2 3 length
+ 4 OUTPUT output
+ 4 MODE mode
+└───
+┌───
+ RRDeleteOutputMode
+ 1 CARD8 major opcode
+ 1 19 RandR opcode
+ 2 3 length
+ 4 OUTPUT output
+ 4 MODE mode
+└───
+┌───
+ RRGetCrtcInfo
+ 1 CARD8 major opcode
+ 1 20 RandR opcode
+ 2 3 length
+ 4 CRTC crtc
+ 4 TIMESTAMP config-timestamp
+ ▶
+ 1 1 Reply
+ 1 RRCONFIGSTATUS status
+ 2 CARD16 sequence number
+ 4 o+p reply length
+ 4 TIMESTATMP timestamp
+ 2 INT16 x
+ 2 INT16 y
+ 2 CARD16 width
+ 2 CARD16 height
+ 4 MODE mode
+ 2 ROTATION current rotation and reflection
+ 2 ROTATION set of possible rotations
+ 2 o number of outputs
+ 2 p number of possible outputs
+ 4o LISTofOUTPUT outputs
+ 4p LISTofOUTPUT possible outputs
+└───
+┌───
+ RRSetCrtcConfig
+ 1 CARD8 major opcode
+ 1 21 RandR opcode
+ 2 7+2n length
+ 4 CRTC crtc
+ 4 TIMESTAMP timestamp
+ 4 TIMESTAMP config timestamp
+ 2 INT16 x
+ 2 INT16 y
+ 4 MODE mode
+ 2 ROTATION rotation/reflection
+ 2 unused
+ 8n LISTofOUTPUT outputs
+ ▶
+ 1 1 Reply
+ 1 RRCONFIGSTATUS status
+ 2 CARD16 sequence number
+ 4 0 reply length
+ 4 TIMESTAMP new timestamp
+ 20 unused
+└───
+┌───
+ RRGetCrtcGammaSize
+ 1 CARD8 major opcode
+ 1 22 RandR opcode
+ 2 2 length
+ 4 CRTC crtc
+ ▶
+ 1 1 Reply
+ 1 unused
+ 2 CARD16 sequence number
+ 4 0 reply length
+ 2 CARD16 size
+ 22 unused
+└───
+┌───
+ RRGetCrtcGamma
+ 1 CARD8 major opcode
+ 1 23 RandR opcode
+ 2 2 length
+ 4 CRTC crtc
+ ▶
+ 1 1 Reply
+ 1 unused
+ 2 CARD16 sequence number
+ 4 (6n+2)/4 reply length
+ 2 n size
+ 20 unused
+ 2n LISTofCARD16 red
+ 2n LISTofCARD16 green
+ 2n LISTofCARD16 blue
+ p unused, p=pad(6n)
+└───
+┌───
+ RRSetCrtcGamma
+ 1 CARD8 major opcode
+ 1 24 RandR opcode
+ 2 3+(6n+2)/4 length
+ 4 CRTC crtc
+ 2 n size
+ 2 unused
+ 2n LISTofCARD16 red
+ 2n LISTofCARD16 green
+ 2n LISTofCARD16 blue
+ p unused, p=pad(6n)
+└───
+
+A.3 Protocol Events
+
+┌───
+ RRScreenChangeNotify
+ 1 Base + 0 code
+ 1 ROTATION new rotation and reflection
+ 2 CARD16 sequence number
+ 4 TIMESTAMP timestamp
+ 4 TIMESTAMP configuration timestamp
+ 4 WINDOW root window
+ 4 WINDOW request window
+ 2 SIZEID size ID
+ 2 SUBPIXELORDER subpixel order defined in Render
+ 2 CARD16 width in pixels
+ 2 CARD16 height in pixels
+ 2 CARD16 width in millimeters
+ 2 CARD16 height in millimeters
+└───
+
+A.3.1 Protocol Events added with version 1.2
+
+┌───
+ RRCrtcChangeNotify
+ 1 Base + 1 code
+ 1 0 sub-code
+ 2 CARD16 sequence number
+ 4 TIMESTAMP timestamp
+ 4 WINDOW request window
+ 4 CRTC crtc affected
+ 4 MODE mode in use
+ 2 ROTATION new rotation and reflection
+ 2 unused
+ 2 INT16 x
+ 2 INT16 y
+ 2 CARD16 width
+ 2 CARD16 height
+└───
+┌───
+ RROutputChangeNotify
+ 1 Base + 1 code
+ 1 1 sub-code
+ 2 CARD16 sequence number
+ 4 TIMESTAMP timestamp
+ 4 TIMESTAMP configuration timestamp
+ 4 WINDOW request window
+ 4 OUTPUT output affected
+ 4 CRTC crtc in use
+ 4 MODE mode in use
+ 2 ROTATION rotation in use
+ 1 CONNECTION connection status
+ 1 SUBPIXELORDER subpixel order
+└───
+┌───
+ RROutputPropertyNotify
+ 1 Base + 1 code
+ 1 2 sub-code
+ 2 CARD16 sequence number
+ 4 WINDOW window
+ 4 OUTPUT output
+ 4 ATOM atom
+ 4 TIMESTAMP time
+ 1 state
+ 0 NewValue
+ 1 Deleted
+ 11 unused
+└───
+
+A.4 Protocol Errors
+
+┌───
+ ERRORS
+ Base + 0 Output
+ Base + 1 Crtc
+ Base + 2 Mode
+└───
+
+Bibliography
+
+[RANDR] Gettys, Jim and Keith Packard, "The X Resize and Rotate
+ Extension - RandR", Proceedings of the 2001 USENIX Annual
+ Technical Conference, Boston, MA
+
+[RENDER]
+ Packard, Keith, "The X Rendering Extension", work in progress,
+ documents found in xc/specs/Render.